Interferons: between structure and function
Katarzyna Bandurska 1 , Izabela Król 1 , Magdalena Myga-Nowak 1Abstract
Interferons are a family of proteins that are released by a variety of cells in response to infections caused by viruses. Currently, we distinguish three types of interferons. They are classified based on the nucleotide sequence, interaction with specific receptors, chromosomal location, structure and physicochemical properties. The following interferons are classified as type I: α, β, ω, κ, ε, ζ, τ, δ, ν. They are recognized and bound by a receptor formed by two peptides, IFN-αR1 and IFN-αR2. Representative of type II interferons is interferon-γ. It binds to a receptor composed of chains IFNGR-1 and IFNGR-2. The recently classified type III interferons comprise IFN-λ1, IFN-λ2, and IFN-λ3. They act on receptors formed by λR1 IFN-and IL-10R2 subunits. A high level of antiviral protection is achieved by IFN-α, IFN-β and IFN-λ. Antiviral activity of interferons is based on the induction and regulation of innate and acquired immune mechanisms. By binding to transmembrane receptors, IFN interacts with target cells mainly by activating the JAK/STAT, but also other signaling pathways. This leads to induction and activation of many antiviral agents, such as protein kinase RNA-activated (PKR), ribonuclease 2-5A pathway, and Mx proteins, as well as numerous apoptotic pathways. As a result of the protective effect of interferons, the virus binding to cells and viral particles penetration into cells is stopped, and the release of the nucleocapsid from an envelope is suppressed. Disruption of transcription and translation processes of the structural proteins prevents the formation of virions or budding of viruses, and as a result degradation of the viral mRNA; the started processes inhibit the chain synthesis of viral proteins and therefore further stimulate the immune system cells.
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